He said that was "evidence that he lacked substantial capacity to appreciate the nature and cons of his conduct and appreciate the wrongfulness."

"I don't think he appreciated the reality that he was inflicting wounds that could lead to her death," he told Davenport lawyer Beth Unger.

Colley was called as a witness at Davenport's bench trial to support the defense claim that he should be found not responsible by reason of mental disease or defect because of a PCP-induced psychosis.

Colley dismissed the idea that Davenport, 33, killed out of jealousy or rage toward Hines, despite a rocky decade-long relationship.

His rantings at the time of the stabbing, which took place in front of their W. 162nd St. building in Washington Heights, had to do with helping Hines.

Morgan Freeman and his step-granddaughter E'dena Hines, who was stabbed to death. (Evan Agostini/AP)

"His releasing demons had absolutely nothing to do with their prior tension in their relationship ... The theme of his delusions were about redemption — not about killing, not about murder," Colley said.

Prevost pointed to a journal entry written by Davenport prior to Hines' death in which he described killing with a knife.

Prosecutors have argued Davenport intended to kill his partner and that he is legally responsible for the heinous act after voluntarily taking the hallucinogenic drug, which he had previous bad reactions to.

Davenport faces a maximum of 25 years to life if convicted. If he's found not responsible, further proceedings will determine a treatment plan.